gmrulz4u Posted January 2, 2004 Report Share Posted January 2, 2004 Car: 1989 Oldsmobile Cutlass Supreme Transmission: 440-T4 I don't know if this is transmission related or not, but when I put it in Reverse, and hit the gas to move backwards, I will sometimes get a LOUD kind of metal to metal grinding noise. Kind of like "datt datt datt datt datt" REALLY fast. I can't say for sure, but it kind of sounds like worn axles that are not making proper contact with the wheels or the transmission. But it will ONLY do this in Reverse, and ONLY if I try to accelerate backwards at a moderate/normal speed. If I just Reverse without hitting the gas pedal at all, it won't make that noise. The only problems I get with going forward in Drive are a "clunky" 1-2 Upshift(especially when hot). Does anyone have any idea as to what may be causing this? It doesn't FEEL like it's internal to the transmission, it feels more like slipping axles or CV joints or something. But I just don't understand what happens to these components when I put the tranny in Reverse, or whats different versus when I'm in Drive? THANKS! Quote Link to comment Share on other sites More sharing options...
SigEpCutlass Posted January 3, 2004 Report Share Posted January 3, 2004 i know exactly what it is!!!! I had the same problem back when I was a member of gmforums. It's your upper engine mounts (aka torque struts or dogbones) With the stock dogbones the rubber inside them dries out and then sometimes you get metal on metal contact (the noise). If i remember correcly you'd have a 2.8L? I have a 3100 so i'll post a picture below so you can see what i'm talking about. I just took new pictures of my car the other day so I'll post pictures in a second post. Quote Link to comment Share on other sites More sharing options...
gmrulz4u Posted January 3, 2004 Author Report Share Posted January 3, 2004 Are you sure?? Cause it does not sound like it's coming from the engine bay at all? I DO think you're right in the sense that it's engine mount related, but I don't know for sure if it's the Dog Bones because I've had them replaced with New ones like 4 times. Although once I remember breaking a Dog Bone right IN HALF! So maybe there's too much stress on the drive-train somewhere?? THANKS MAN! Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 3, 2004 Report Share Posted January 3, 2004 When and axle or CV joint is going out, they make noises when in reverse. I doubt its a dogbone bushing, you car just look at the bushing to tell if its bad. Again, dont think its a dogbone Quote Link to comment Share on other sites More sharing options...
SigEpCutlass Posted January 3, 2004 Report Share Posted January 3, 2004 i had the problem going in reverse and in the 1-2 area as you mentioned. Sometimes, you can't tell if the bushing is shot, without taking it out. Mine looked fine, but they weren't. I had some small cracking on the outside, and i just replaced the entire dogbone. $18 from NAPA, and $45 per from the GM dealer. Here are the pictures from this summer before I cleaned my engine and replaced the dogbones and other stuff (:oops: so dirty) As you can see from the pictures, there is no visible damage. There were some really small cracks that don't show up here. Again, to make sure my dogbones stay good, i spray armorall protectant on the rubber bushings to ensure they don't dry out and crack. You mentioned that you've replaced them before (dogbones). What did you replace? I replaced the entire thing with a NAPA part instead of messing with a bushing. If you only replaced the bushing, are you sure you installed the bushing correctly? I know that may sound like a stupid question, but if it's not alligned properly, I'm sure the physical forces would rip the bushing eventually. You may just be better off replacing the entire thing like i did. It's your decision though. Hope this helps. EDIT: Also what's the milage on your car? Quote Link to comment Share on other sites More sharing options...
Robby1870 Posted January 3, 2004 Report Share Posted January 3, 2004 You can definitely tell if the bushings are shot just by looking at them. Have some one watch the motor with the hood up when you put it in gear and see how much it rocks. Also, just undo the dogbone and look inside Quote Link to comment Share on other sites More sharing options...
Guest TurboSedan Posted January 3, 2004 Report Share Posted January 3, 2004 i have ripped up alot of these. i now have the 3-point dogbones on both sides, but i still need to replace the bushings. mine look fine too but IMO the engine moves way too much. even a touch of the throttle in 1st from a stop will cause quite a jolt. when i had the auto in the car i never had any problems with the dogbones, since i swapped in a manual - the dogbones are quickly trashed. hopefully new poly bushings will be the answer. joshua Quote Link to comment Share on other sites More sharing options...
SigEpCutlass Posted January 3, 2004 Report Share Posted January 3, 2004 you guys hit the nail right on the head. I forgot to mention engine movement. I remember when I was looking at my engine with my dad changing the gear, it took one hell of a jump when put in reverse. I have what the 3100's bolts for the mounts are suppossed to be torqued to. I dunno what the 2.8's suppossed to be. I can get mine out of my manual on a post it note if you want it. Just let me know. Quote Link to comment Share on other sites More sharing options...
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